Department of Ultrasonography , the Second Hospital of Hebei Medical University , Shijiazhuang 050000 ,China;
Department of Ultrasonography , the Second Hospital of Hebei Medical University , Shijiazhuang 050000 ,China;
Department of Ultrasonography , the Second Hospital of Hebei Medical University , Shijiazhuang 050000 ,China;
Department of Ultrasonography , the Second Hospital of Hebei Medical University , Shijiazhuang 050000 ,China;
